Description
Lodestar 500 is a combined solid state Attitude and Heading Reference System (AHRS) and optional SPRINT Acoustically Aided Inertial Navigation System (AAINS). The instrument is comprised of three high grade, highly reliability, commercially available, Ring Laser Gyros (RLG) and accelerometers. The sensors are also the standard for commercial aviation with a proven 15+ year track record. Lodestar AHRS requires no external aiding and can settle in 5 minutes or less in dynamic conditions. SPRINT INS adds advanced Aided Inertial Navigation that runs concurrently with the Lodestar AHRS algorithm. This dual algorithm capability is unique in the market and allows for dual use from one inertial instrument, e.g. Lodestar AHRS for ROV, SPRINT INS for Survey. On-board data storage and backup battery functionality ensures continued operation and no data-loss even if communications or external power is lost.
Specifications
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Other specifications
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Graphical user interface
Y
Typical application
Acoustical Aided INS for high accuracy survey; subsea metrology and DP. IMO certified AHRS.
Distinguishable features
Customised for reliable use in commercial marine applications and for optimal integration with acoustic positioning systems.
Export restrictions
US Commerce controled
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Environmental
-
Non-operating shock tolerance [g]
22
Operating shock tolerance [g]
10
Max. rotation speed [deg/s]
500
Min. operating temperature [°C]
-10
Max. operating temperature [°C]
55
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Software
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Name
Lodestar
Filtering
Y
Adaptable filter strength
Yes
Adaptable input signals
Y
Integrity monitoring of position input
Y
Integrity monitoring of log input
Y
Max. number of position input signals
3
Max. number of log input signals
1
Maximum latency of position input [ms]
10000
Uncertainty indicators given in output
1DRMS; 1sigma RMS; error ellipse; etc
Uncertainty of time stamp for output [ms]
0.001
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Doppler log aided uncertainty
-
Heading [deg]
0.1
Pitch [deg]
0.01
Roll [deg]
0.01
Heave [m]
0.02
Decrease in position accuracy [m/hr]
3
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GNSS aided uncertainty
-
Heading [deg]
0.04
Pitch [deg]
0.01
Roll [deg]
0.01
Heave: constant part [m]
0.05
Heave: variable part [%]
5
Surge/sway [m]
0.05
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General
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Height [m]
0.26
Width [m]
0.205
Length [m]
0.205
Weight [kg]
18.5
Min. Voltage (DC)
20
Max. Voltage (DC)
50
Power consumption [W]
15
Splashproof casting
Y
Water resistant casting
Y
Water resistance [m]
6000
Mean time between failures [hr]
400000
Type of accelerometer
Closed-loop (force feedback) Q-Flex
Type of gyro
Ring Laser Gyro (RLG)
Removable from base plate
Y
Type of application
Marine
Moving parts
N
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EM log aided uncertainty
-
Heading [deg]
0.1
Pitch [deg]
0.01
Roll [deg]
0.01
Heave [m]
0.05
Surge/sway [m]
0.05
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Unaided uncertainty
-
Heading [deg]
0.1
Pitch [deg]
0.01
Roll [deg]
0.01
Heave [m]
0.05
Decrease in position accuracy [m/hr]
0.3
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Data formats
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NMEA formats
GGA; GLL; ZDA; VTG; ACK; PRDID; PHTRO; HDT; THS; M
Other
binary and ASCII messages
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Inertial Measurement Unit
-
Accelerometer bias [µ-g]
200
gyro bias [deg/hr]
0.01
Calibration procedure
IMU is factory calibrated - no user calibration required. DVL calibration procedure supplied
